Hi is your Nokia phone is not detecting your sim whether it is displaying messages like sim invalid or sim lock message once you insert your sim in it then it mean your phone is locked to some other network provider due to this you can't use other network sim in it until you unlock it .You can easily unlock your phone through providers like SimpleUnlocking.com they are rendering unlock code for all mobile models at reliable cost .You first check that whether the code is available for your mobile model ,country and network provider .If yes then pay for it and unlock your phone ....
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